Brown, Ray Andrews, author
Callaghan & Company, 1955
Buku Teks
Fortess Press, 1978
Buku Teks
edited by Andrew J. Cherlin
McGraw-Hil, 2013
Buku Teks
Brown, Gordon W.
McGraw-Hill , 1984
Buku Teks
Simons, Henry C., author
University of Chicago Press, 1955
Buku Teks